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Yamaha SR500 1978 Caferacer project

This is a discussion on Yamaha SR500 1978 Caferacer project within the Project Builds forums, part of the Caferacer.net Forums category; Hey - if you're happy to throw your wallet at it, it's all good....

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Thread: Yamaha SR500 1978 Caferacer project

  1. #31
    Senior Member hillsy's Avatar
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    Hey - if you're happy to throw your wallet at it, it's all good.

  2. #32
    Banned Witworth's Avatar
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    I think the K&J steel one would be better.

    If you get the alloy one you will only get the full benefit of it being lighter by having good quality, high end, USD shocks. Like WP or Ohlins.

    SR swingarms don't break for me. I must have used or owned 12 of them.

    I think the steel FZR600 swingarm is much longer than the stock SR one. A longer swingarm is not really any benefit on a SR500.

    The Japanese fit FZR400 aluminum swingarms to SR's after welding on shock mounts. I think they are slightly shorter than the FZR600 ones.

    Danger, is my business."
    Last edited by Witworth; 06-25-2015 at 04:32 AM.

  3. #33
    Senior Member kenessex's Avatar
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    There are some who feel that the stock swingarm is adequate and it probably is for street riding. There are many more that have not broken or cracked than have. However, in my experience racing 2 of them I have had a 100% breakage rate. Granted that is only a sampling of 2, but it is also by someone who has raced rather than someone that has never held a race license with any recognized sanctioning organization. All of my street bikes are drilled and wired for the track, just in case I decide I want to race one. Therefore, an SR500 in my garage would not have a stock swingarm and be considered finished. That is just me.

    I have not done any measurements, but for a cheaper steel swingarm you could look at the FJ600 and weld on shock mounts or look at the FZ600 for aluminum and weld on the shock mounts. I have both at home and can get measurements when I get there if there is any interest.
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  5. #34
    Senior Member Tonnystark's Avatar
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    I looked at my swing arm just now and do see where the stamped plate welded top and bottom to the pivot tube could have been made much better..I understand most are broken on the left side,so could one weld in a 3/8-1/2 inch thick steel plate at both sides,standing about 1 inch tall or so..? Cut and weld it in as a single piece tight filling gusset, to encircle the pivot tube and extend the plate back a few inches ,top and bottom? I know the nylon chain roller is also on that LH side so the gusset would have to be located accordingly.. it could be more cost effective than an arm replacement on a road bike..
    78' SR500
    64' YG1S
    15' XT250

  6. #35
    Senior Member hillsy's Avatar
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    Quote Originally Posted by Tonnystark View Post
    I looked at my swing arm just now and do see where the stamped plate welded top and bottom to the pivot tube could have been made much better..I understand most are broken on the left side,so could one weld in a 3/8-1/2 inch thick steel plate at both sides,standing about 1 inch tall or so..? Cut and weld it in as a single piece tight filling gusset, to encircle the pivot tube and extend the plate back a few inches ,top and bottom? I know the nylon chain roller is also on that LH side so the gusset would have to be located accordingly.. it could be more cost effective than an arm replacement on a road bike..
    Sure you could do all that but then again you could get an FZ/FZR swing arm for $50 and trim it down at the pivot. Then some tabs for the shock mounts and you're good to go without the danger of warping the stock arm with all that welded on bracing.

    92 Yamaha FZR600 FZR 600 Swing Arm DDD60 | eBay

    They don't look overly long:


  7. #36
    Member Quickshifter's Avatar
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    Its been a long time since my last post,

    Had little time to work on the SR because i was very busy with work! Had some really nice jobs. Rebuilt a YFZ450 engine with a broken piston. Rebuilt a old 83 XV920 engine wich had about everything that can break broken. Rebuilt the cilinder head of a FJR1300 and a R1. All running fine now! Also had my first race of the season on Assen, did a 200+kmh highsider in the wet and now my ass hurts like hell.

    So, no riding for a week.

    Im leaving saturday for a little vacation and the next week going to Hockenheim for another race weekend!

    Last thing I did on the SR was fitting a bigger main jet (270). Still running too lean, but alot better, ordered 280/290/300. Im close!

    Also still waiting on my left brake disc.....

    After hockenheim ill get the carburettor right and then its of to the painter!
    Yamaha SR-01 ''Heritage'' , SR500 special edition since 1978
    Yamaha SR-02 ''King Kenny''

  8. #37
    Member Quickshifter's Avatar
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    SR500 is running fine now, still waiting on that damn brake disc. Thinking about converting it to 1 disc again. But, in the mean while ive been busy with antoher little project. Restoring a Honda SS50Z k3 from 1979!

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    raven likes this.
    Yamaha SR-01 ''Heritage'' , SR500 special edition since 1978
    Yamaha SR-02 ''King Kenny''

  9. #38
    Senior Member TSwami's Avatar
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    That little Honda looks great, nice work. I like the black and yellow. Probably a fun little bike.
    Faster, faster, faster, until the thrill of speed overcomes the fear of death. ~Hunter Thompson

  10. #39
    Senior Member Farmer_John's Avatar
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    pedal, pedal, pedal!!!

  11. #40
    Senior Member knappyfeet's Avatar
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    Nice little mowsheen. Just like swami.......I like the black and yellow.

    With my weight I feel I would be peddling way more than I would care for.

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